@Kikikikibuu thanks for the translation. There seems to be a mistranslation in page 12:
"my grandfather, who hadn't won a single battle during wartime said that her unit's training was the toughest he had experienced."
I think it should be "who hadn't LOST a single...."
Otherwise nobody would find it surprising that the grandpa found the training was the toughest, since the old man kept losing anyway, meaning that his skill would either be very low or his opponents were far too strong.